There is a very helpful detailed explanation of the sports diff fault on here. Including pictures. It's one of two sensors. Very hard to reach need a special socket. Don't change both sensors at once, anyway check the threads. For update purposes mine is on for now, sometimes...
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S8FRD 2002 D2 S8 on LPG 213K just passed MOT, again, no issues. Owned since 2007
**60*** Unicorn, 2012 D4 Havana Black, 4.2TDI ~60K miles Cream Leather, £25K of Factory extras including B+O Owned since 04/2018
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